**Core Concept**
A Rosette cataract is a type of nuclear cataract characterized by a spoke-like or rosette-like pattern within the lens, often associated with a specific underlying condition. This type of cataract is typically seen in patients with a particular systemic disease.

**Why the Correct Answer is Right**
The correct answer is associated with Diabetes Mellitus, a chronic metabolic disorder that affects glucose regulation in the body. The high levels of glucose in the blood can lead to the accumulation of sorbitol within the lens, causing osmotic stress and eventually leading to the characteristic rosette formation. This is due to the enzyme aldose reductase, which converts glucose to sorbitol, and the subsequent glycolytic pathway that disrupts the normal lens structure.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as the condition typically associated with a "sunflower" cataract, not a rosette cataract.
* **Option B:** This option is incorrect as the condition typically associated with a "snowflake" cataract, not a rosette cataract.
* **Option C:** This option is incorrect as the condition typically associated with a cortical cataract, not a rosette cataract.

**Clinical Pearl / High-Yield Fact**
In patients with diabetes, regular ophthalmological check-ups are crucial to detect and manage cataracts, as early intervention can prevent vision loss and improve quality of life.

**Correct Answer: D. Diabetes Mellitus.**